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print-ospf.c

/*
 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-ospf.c,v 1.45.2.4 2004/03/24 02:44:30 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
#include "gmpls.h"

#include "ospf.h"

#include "ip.h"

static struct tok ospf_option_values[] = {
      { OSPF_OPTION_T,  "TOS" },
      { OSPF_OPTION_E,  "External" },
      { OSPF_OPTION_MC, "Multicast" },
      { OSPF_OPTION_NP, "NSSA" },
      { OSPF_OPTION_EA, "Advertise External" },
      { OSPF_OPTION_DC, "Demand Circuit" },
      { OSPF_OPTION_O,  "Opaque" },
      { 0,              NULL }
};

static struct tok ospf_authtype_values[] = {
      { OSPF_AUTH_NONE, "none" },
      { OSPF_AUTH_NONE, "simple" },
      { OSPF_AUTH_MD5,  "MD5" },
      { 0,              NULL }
};

static struct tok ospf_rla_flag_values[] = {
      { RLA_FLAG_B,           "ABR" },
      { RLA_FLAG_E,           "ASBR" },
      { RLA_FLAG_W1,          "Virtual" },
      { RLA_FLAG_W2,          "W2" },
      { 0,              NULL }
};

static struct tok type2str[] = {
      { OSPF_TYPE_UMD,  "UMD" },
      { OSPF_TYPE_HELLO,      "Hello" },
      { OSPF_TYPE_DD,         "Database Description" },
      { OSPF_TYPE_LS_REQ,     "LS-Request" },
      { OSPF_TYPE_LS_UPDATE,  "LS-Update" },
      { OSPF_TYPE_LS_ACK,     "LS-Ack" },
      { 0,              NULL }
};

static struct tok lsa_values[] = {
      { LS_TYPE_ROUTER,       "Router" },
      { LS_TYPE_NETWORK,      "Network" },
      { LS_TYPE_SUM_IP,       "Summary" },
      { LS_TYPE_SUM_ABR,      "ASBR Summary" },
      { LS_TYPE_ASE,          "External" },
      { LS_TYPE_GROUP,        "Multicast Group" },
      { LS_TYPE_NSSA,         "NSSA" },
      { LS_TYPE_OPAQUE_LL,    "Link Local Opaque" },
      { LS_TYPE_OPAQUE_AL,    "Area Local Opaque" },
      { LS_TYPE_OPAQUE_DW,    "Domain Wide Opaque" },
      { 0,              NULL }
};

static struct tok ospf_dd_flag_values[] = {
      { OSPF_DB_INIT,           "Init" },
      { OSPF_DB_MORE,           "More" },
      { OSPF_DB_MASTER, "Master" },
      { 0,              NULL }
};

static struct tok lsa_opaque_values[] = {
      { LS_OPAQUE_TYPE_TE,    "Traffic Engineering" },
      { LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
      { 0,              NULL }
};

static struct tok lsa_opaque_te_tlv_values[] = {
      { LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
      { LS_OPAQUE_TE_TLV_LINK,   "Link" },
      { 0,              NULL }
};

static struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE,            "Link Type" },
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID,              "Link ID" },
      { LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP,             "Local Interface IP address" },
      { LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP,            "Remote Interface IP address" },
      { LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC,            "Traffic Engineering Metric" },
      { LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW,               "Maximum Bandwidth" },
      { LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW,           "Maximum Reservable Bandwidth" },
      { LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW,             "Unreserved Bandwidth" },
      { LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP,          "Administrative Group" },
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
      { LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR,    "Interface Switching Capability" },
      { LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP,    "Shared Risk Link Group" },
      { 0,              NULL }
};

#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP        1  /* rfc3630 */
#define LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA         2  /* rfc3630 */

static struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
      { LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA,  "Multi-Access" },
      { 0,              NULL }
};

static char tstr[] = " [|ospf]";

#ifdef WIN32
#define inline __inline
#endif /* WIN32 */

static int ospf_print_lshdr(const struct lsa_hdr *);
static const u_char *ospf_print_lsa(const struct lsa *);
static int ospf_decode_v2(const struct ospfhdr *, const u_char *);

static int
ospf_print_lshdr(register const struct lsa_hdr *lshp)
{
        u_int ls_length;

        TCHECK(lshp->ls_length);
        ls_length = EXTRACT_16BITS(&lshp->ls_length);
        if (ls_length < sizeof(struct lsa_hdr)) {
                printf("\n\t    Bogus length %u < %lu", ls_length,
                    (unsigned long)sizeof(struct lsa_hdr));
                return(-1);
        }

        TCHECK(lshp->ls_seq); /* XXX - ls_length check checked this */
      printf("\n\t  Advertising Router: %s, seq 0x%08x, age %us, length: %u",
             ipaddr_string(&lshp->ls_router),
             EXTRACT_32BITS(&lshp->ls_seq),
             EXTRACT_16BITS(&lshp->ls_age),
               ls_length-(u_int)sizeof(struct lsa_hdr));

      TCHECK(lshp->ls_type);  /* XXX - ls_length check checked this */
        switch (lshp->ls_type) {
      /* the LSA header for opaque LSAs was slightly changed */
        case LS_TYPE_OPAQUE_LL:
        case LS_TYPE_OPAQUE_AL:
        case LS_TYPE_OPAQUE_DW:
            printf("\n\t    %s LSA (%d), Opaque-Type: %s LSA (%u), Opaque-ID: %u",
                   tok2str(lsa_values,"unknown",lshp->ls_type),
                   lshp->ls_type,

               tok2str(lsa_opaque_values,
                     "unknown",
                     *(&lshp->un_lsa_id.opaque_field.opaque_type)),
               *(&lshp->un_lsa_id.opaque_field.opaque_type),
               EXTRACT_24BITS(&lshp->un_lsa_id.opaque_field.opaque_id)
                   
                   );
            break;

      /* all other LSA types use regular style LSA headers */
      default:
            printf("\n\t    %s LSA (%d), LSA-ID: %s",
                   tok2str(lsa_values,"unknown",lshp->ls_type),
                   lshp->ls_type,
                   ipaddr_string(&lshp->un_lsa_id.lsa_id));
            break;
        }

      TCHECK(lshp->ls_options);     /* XXX - ls_length check checked this */
        printf("\n\t    Options: [%s]", bittok2str(ospf_option_values,"none",lshp->ls_options));

        return (ls_length);
trunc:
      return (-1);
}

/*
 * Print a single link state advertisement.  If truncated or if LSA length
 * field is less than the length of the LSA header, return NULl, else
 * return pointer to data past end of LSA.
 */
static const u_int8_t *
ospf_print_lsa(register const struct lsa *lsap)
{
      register const u_int8_t *ls_end;
      register const struct rlalink *rlp;
      register const struct tos_metric *tosp;
      register const struct in_addr *ap;
      register const struct aslametric *almp;
      register const struct mcla *mcp;
      register const u_int32_t *lp;
      register int j, k, tlv_type, tlv_length, subtlv_type, subtlv_length, priority_level;
      register int ls_length;
      const u_int8_t *tptr;
      int count_srlg;
        union { /* int to float conversion buffer for several subTLVs */
            float f; 
            u_int32_t i;
        } bw;

      tptr = (u_int8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
        ls_length = ospf_print_lshdr(&lsap->ls_hdr);
        if (ls_length == -1)
                return(NULL);
      ls_end = (u_int8_t *)lsap + ls_length;
      ls_length -= sizeof(struct lsa_hdr);

      switch (lsap->ls_hdr.ls_type) {

      case LS_TYPE_ROUTER:
            TCHECK(lsap->lsa_un.un_rla.rla_flags);
                printf("\n\t    Router LSA Options: [%s]", bittok2str(ospf_rla_flag_values,"none",lsap->lsa_un.un_rla.rla_flags));

            TCHECK(lsap->lsa_un.un_rla.rla_count);
            j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
            TCHECK(lsap->lsa_un.un_rla.rla_link);
            rlp = lsap->lsa_un.un_rla.rla_link;
            while (j--) {
                  TCHECK(*rlp);
                  switch (rlp->link_type) {

                  case RLA_TYPE_VIRTUAL:
                        printf("\n\t      Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
                            ipaddr_string(&rlp->link_id),
                            ipaddr_string(&rlp->link_data)); 
                                break;

                  case RLA_TYPE_ROUTER:
                        printf("\n\t      Neighbor Router-ID: %s, Interface Address: %s",
                            ipaddr_string(&rlp->link_id),
                            ipaddr_string(&rlp->link_data));
                        break;

                  case RLA_TYPE_TRANSIT:
                        printf("\n\t      Neighbor Network-ID: %s, Interface Address: %s",
                            ipaddr_string(&rlp->link_id),
                            ipaddr_string(&rlp->link_data));
                        break;

                  case RLA_TYPE_STUB:
                        printf("\n\t      Stub Network: %s, Mask: %s",
                            ipaddr_string(&rlp->link_id),
                            ipaddr_string(&rlp->link_data));
                        break;

                  default:
                        printf("\n\t      Unknown Router Link Type (%u)",
                            rlp->link_type);
                        return (ls_end);
                  }
                  printf(", tos 0, metric: %d", EXTRACT_16BITS(&rlp->link_tos0metric));
                  tosp = (struct tos_metric *)
                      ((sizeof rlp->link_tos0metric) + (u_char *) rlp);
                  for (k = 0; k < (int) rlp->link_toscount; ++k, ++tosp) {
                        TCHECK(*tosp);
                        printf(", tos %d, metric: %d",
                            tosp->tos_type,
                            EXTRACT_16BITS(&tosp->tos_metric));
                  }
                  rlp = (struct rlalink *)((u_char *)(rlp + 1) +
                      ((rlp->link_toscount) * sizeof(*tosp)));
            }
            break;

      case LS_TYPE_NETWORK:
            TCHECK(lsap->lsa_un.un_nla.nla_mask);
            printf("\n\t    Mask %s\n\t    Connected Routers:",
                ipaddr_string(&lsap->lsa_un.un_nla.nla_mask));
            ap = lsap->lsa_un.un_nla.nla_router;
            while ((u_char *)ap < ls_end) {
                  TCHECK(*ap);
                  printf("\n\t      %s", ipaddr_string(ap));
                  ++ap;
            }
            break;

      case LS_TYPE_SUM_IP:
            TCHECK(lsap->lsa_un.un_nla.nla_mask);
            printf("\n\t    Mask %s",
                ipaddr_string(&lsap->lsa_un.un_sla.sla_mask));
            TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
            lp = lsap->lsa_un.un_sla.sla_tosmetric;
                /* suppress tos if its not supported */
                if(!((lsap->ls_hdr.ls_options)&OSPF_OPTION_T)) {
                    printf(", metric: %u", EXTRACT_32BITS(lp)&SLA_MASK_METRIC);
                    break;
                }
            while ((u_char *)lp < ls_end) {
                  register u_int32_t ul;

                  TCHECK(*lp);
                  ul = EXTRACT_32BITS(lp);
                  printf(", tos %d metric %d",
                      (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
                      ul & SLA_MASK_METRIC);
                  ++lp;
            }
            break;

      case LS_TYPE_SUM_ABR:
            TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
            lp = lsap->lsa_un.un_sla.sla_tosmetric;
                /* suppress tos if its not supported */
                if(!((lsap->ls_hdr.ls_options)&OSPF_OPTION_T)) {
                    printf(", metric: %u", EXTRACT_32BITS(lp)&SLA_MASK_METRIC);
                    break;
                }
            while ((u_char *)lp < ls_end) {
                  register u_int32_t ul;

                  TCHECK(*lp);
                  ul = EXTRACT_32BITS(lp);
                  printf(", tos %d metric %d",
                      (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS,
                      ul & SLA_MASK_METRIC);
                  ++lp;
            }
            break;

      case LS_TYPE_ASE:
            TCHECK(lsap->lsa_un.un_nla.nla_mask);
            printf("\n\t    Mask %s",
                ipaddr_string(&lsap->lsa_un.un_asla.asla_mask));

            TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
            almp = lsap->lsa_un.un_asla.asla_metric;
            while ((u_char *)almp < ls_end) {
                  register u_int32_t ul;

                  TCHECK(almp->asla_tosmetric);
                  ul = EXTRACT_32BITS(&almp->asla_tosmetric);
                  printf(", type %d, tos %d metric:",
                      (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1,
                      (ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
                        if ((ul & ASLA_MASK_METRIC)==0xffffff)
                            printf(" infinite");
                        else
                            printf(" %d", (ul & ASLA_MASK_METRIC));

                  TCHECK(almp->asla_forward);
                  if (almp->asla_forward.s_addr) {
                        printf(", forward %s",
                            ipaddr_string(&almp->asla_forward));
                  }
                  TCHECK(almp->asla_tag);
                  if (almp->asla_tag.s_addr) {
                        printf(", tag %s",
                            ipaddr_string(&almp->asla_tag));
                  }
                  ++almp;
            }
            break;

      case LS_TYPE_GROUP:
            /* Multicast extensions as of 23 July 1991 */
            mcp = lsap->lsa_un.un_mcla;
            while ((u_char *)mcp < ls_end) {
                  TCHECK(mcp->mcla_vid);
                  switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {

                  case MCLA_VERTEX_ROUTER:
                        printf("\n\t    Router Router-ID %s",
                            ipaddr_string(&mcp->mcla_vid));
                        break;

                  case MCLA_VERTEX_NETWORK:
                        printf("\n\t    Network Designated Router %s",
                            ipaddr_string(&mcp->mcla_vid));
                        break;

                  default:
                        printf("\n\t    unknown VertexType (%u)",
                            EXTRACT_32BITS(&mcp->mcla_vtype));
                        break;
                  }
            ++mcp;
            }
            break;

      case LS_TYPE_OPAQUE_LL: /* fall through */
      case LS_TYPE_OPAQUE_AL: 
      case LS_TYPE_OPAQUE_DW:

          switch (*(&lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
          case LS_OPAQUE_TYPE_TE:
            tptr = (u_int8_t *)(&lsap->lsa_un.un_te_lsa_tlv.type);

            while (ls_length != 0) {
                    TCHECK2(*tptr, 4);
                if (ls_length < 4) {
                        printf("\n\t    Remaining LS length %u < 4", ls_length);
                        return(ls_end);
                    }
                    tlv_type = EXTRACT_16BITS(tptr);
                    tlv_length = EXTRACT_16BITS(tptr+2);
                    tptr+=4;
                    ls_length-=4;
                    
                    printf("\n\t    %s TLV (%u), length: %u",
                           tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
                           tlv_type,
                           tlv_length);

                    if (tlv_length > ls_length) {
                        printf("\n\t    Bogus length %u > %u", tlv_length,
                            ls_length);
                        return(ls_end);
                    }
                    ls_length-=tlv_length;
                    switch(tlv_type) {
                    case LS_OPAQUE_TE_TLV_LINK:
                        while (tlv_length != 0) {
                            if (tlv_length < 4) {
                                printf("\n\t    Remaining TLV length %u < 4",
                                    tlv_length);
                                return(ls_end);
                            }
                            TCHECK2(*tptr, 4);
                            subtlv_type = EXTRACT_16BITS(tptr);
                            subtlv_length = EXTRACT_16BITS(tptr+2);
                            tptr+=4;
                            tlv_length-=4;
                            
                            printf("\n\t      %s subTLV (%u), length: %u",
                                   tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
                                   subtlv_type,
                                   subtlv_length);
                            
                            TCHECK2(*tptr, subtlv_length);
                            switch(subtlv_type) {
                            case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
                                printf(", 0x%08x", EXTRACT_32BITS(tptr));
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
                            case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
                                printf(", %s (0x%08x)",
                                       ipaddr_string(tptr),
                                       EXTRACT_32BITS(tptr));
                                if (subtlv_length == 8) /* draft-ietf-ccamp-ospf-gmpls-extensions */
                                    printf(", %s (0x%08x)",
                                           ipaddr_string(tptr+4),
                                           EXTRACT_32BITS(tptr+4));
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
                            case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
                                printf(", %s", ipaddr_string(tptr));
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
                            case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
                                bw.i = EXTRACT_32BITS(tptr);
                                printf(", %.3f Mbps", bw.f*8/1000000 );
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
                                for (priority_level = 0; priority_level < 8; priority_level++) {
                                    bw.i = EXTRACT_32BITS(tptr+priority_level*4);
                                    printf("\n\t\tpriority level %d: %.3f Mbps",
                                           priority_level,
                                           bw.f*8/1000000 );
                                }
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
                                printf(", Metric %u", EXTRACT_32BITS(tptr));
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
                                printf(", %s, Priority %u",
                                       bittok2str(gmpls_link_prot_values, "none", *tptr),
                                       *(tptr+1));
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
                                printf("\n\t\tInterface Switching Capability: %s",
                                       tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
                                printf("\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
                                       tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
                                for (priority_level = 0; priority_level < 8; priority_level++) {
                                    bw.i = EXTRACT_32BITS(tptr+4+(priority_level*4));
                                    printf("\n\t\t  priority level %d: %.3f Mbps",
                                           priority_level,
                                           bw.f*8/1000000 );
                                }
                                break;
                            case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
                                printf(", %s (%u)",
                                       tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",*tptr),
                                       *tptr);
                                break;

                            case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
                                count_srlg = subtlv_length / 4;
                                if (count_srlg != 0)
                                     printf("\n\t\t  Shared risk group: ");
                                while (count_srlg > 0) {
                                        bw.i = EXTRACT_32BITS(tptr);
                                        printf("%d",bw.i);
                                        tptr+=4;
                                        count_srlg--;
                                        if (count_srlg > 0)
                                            printf(", ");
                                }
                                break;

                            default:
                                if (vflag <= 1) {
                                    if(!print_unknown_data(tptr,"\n\t\t",subtlv_length))
                                        return(ls_end);
                                }
                                break;
                            }
                            /* in OSPF everything has to be 32-bit aligned, including TLVs */
                            if (subtlv_length%4 != 0)
                                subtlv_length+=4-(subtlv_length%4);
                            
                            tlv_length-=subtlv_length;
                            tptr+=subtlv_length;
                            
                        }
                        break;
                        
                    case LS_OPAQUE_TE_TLV_ROUTER:
                        if (tlv_length < 4) {
                            printf("\n\t    TLV length %u < 4", tlv_length);
                            return(ls_end);
                        }
                        TCHECK2(*tptr, 4);
                        printf(", %s", ipaddr_string(tptr));
                        break;
                        
                    default:
                        if (vflag <= 1) {
                            if(!print_unknown_data(tptr,"\n\t      ",tlv_length))
                                return(ls_end);
                        }
                        break;
                    }
                    tptr+=tlv_length;
            }
                break;
          }
          break;
        default:
            if (vflag <= 1) {
                if(!print_unknown_data((u_int8_t *)lsap->lsa_un.un_unknown,
                                       "\n\t    ", ls_length))
                    return(ls_end);
            } 
            break;
        }

        /* do we want to see an additionally hexdump ? */
        if (vflag> 1)
            if(!print_unknown_data((u_int8_t *)lsap->lsa_un.un_unknown,
                                   "\n\t    ", ls_length)) {
                return(ls_end);
            }
        
      return (ls_end);
trunc:
      return (NULL);
}

static int
ospf_decode_v2(register const struct ospfhdr *op,
    register const u_char *dataend)
{
      register const struct in_addr *ap;
      register const struct lsr *lsrp;
      register const struct lsa_hdr *lshp;
      register const struct lsa *lsap;
      register u_int32_t lsa_count,lsa_count_max;

      switch (op->ospf_type) {

      case OSPF_TYPE_UMD:
            /*
             * Rob Coltun's special monitoring packets;
             * do nothing
             */
            break;

      case OSPF_TYPE_HELLO:
                printf("\n\tOptions: [%s]",
                       bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options));

                TCHECK(op->ospf_hello.hello_deadint);
                printf("\n\t  Hello Timer: %us, Dead Timer %us, Mask: %s, Priority: %u",
                       EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
                       EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
                       ipaddr_string(&op->ospf_hello.hello_mask),
                       op->ospf_hello.hello_priority);

            TCHECK(op->ospf_hello.hello_dr);
            if (op->ospf_hello.hello_dr.s_addr != 0)
                  printf("\n\t  Designated Router %s",
                      ipaddr_string(&op->ospf_hello.hello_dr));

            TCHECK(op->ospf_hello.hello_bdr);
            if (op->ospf_hello.hello_bdr.s_addr != 0)
                  printf(", Backup Designated Router %s",
                      ipaddr_string(&op->ospf_hello.hello_bdr));

                ap = op->ospf_hello.hello_neighbor;
                if ((u_char *)ap < dataend)
                        printf("\n\t  Neighbor List:");
                while ((u_char *)ap < dataend) {
                        TCHECK(*ap);
                        printf("\n\t    %s", ipaddr_string(ap));
                        ++ap;
                }
            break;      /* HELLO */

      case OSPF_TYPE_DD:
            TCHECK(op->ospf_db.db_options);
                printf("\n\tOptions: [%s]",
                       bittok2str(ospf_option_values,"none",op->ospf_db.db_options));
            TCHECK(op->ospf_db.db_flags);
                printf(", DD Flags: [%s]",
                       bittok2str(ospf_dd_flag_values,"none",op->ospf_db.db_flags));

            if (vflag) {
                  /* Print all the LS adv's */
                  lshp = op->ospf_db.db_lshdr;
                  while (ospf_print_lshdr(lshp) != -1) {
                        ++lshp;
                  }
            }
            break;

      case OSPF_TYPE_LS_REQ:
                lsrp = op->ospf_lsr;
                while ((u_char *)lsrp < dataend) {
                    TCHECK(*lsrp);

                    printf("\n\t  Advertising Router: %s, %s LSA (%u)",
                           ipaddr_string(&lsrp->ls_router),
                           tok2str(lsa_values,"unknown",EXTRACT_32BITS(lsrp->ls_type)),
                           EXTRACT_32BITS(&lsrp->ls_type));

                    switch (EXTRACT_32BITS(lsrp->ls_type)) {
                        /* the LSA header for opaque LSAs was slightly changed */
                    case LS_TYPE_OPAQUE_LL:
                    case LS_TYPE_OPAQUE_AL:
                    case LS_TYPE_OPAQUE_DW:
                        printf(", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
                               tok2str(lsa_opaque_values, "unknown",lsrp->un_ls_stateid.opaque_field.opaque_type),
                               lsrp->un_ls_stateid.opaque_field.opaque_type,
                               EXTRACT_24BITS(&lsrp->un_ls_stateid.opaque_field.opaque_id));
                        break;
                    default:
                        printf(", LSA-ID: %s",
                               ipaddr_string(&lsrp->un_ls_stateid.ls_stateid));
                        break;
                    }
                    
                    ++lsrp;
                }
            break;

      case OSPF_TYPE_LS_UPDATE:
                lsap = op->ospf_lsu.lsu_lsa;
                TCHECK(op->ospf_lsu.lsu_count);
                lsa_count_max = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
                printf(", %d LSA%s",lsa_count_max, lsa_count_max > 1 ? "s" : "");
                for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
                    printf("\n\t  LSA #%u",lsa_count);
                        lsap = (const struct lsa *)ospf_print_lsa(lsap);
                        if (lsap == NULL)
                                goto trunc;
                }
            break;

      case OSPF_TYPE_LS_ACK:
                lshp = op->ospf_lsa.lsa_lshdr;
                while (ospf_print_lshdr(lshp) != -1) {
                    ++lshp;
                }
                break;

      default:
            printf("v2 type (%d)", op->ospf_type);
            break;
      }
      return (0);
trunc:
      return (1);
}

void
ospf_print(register const u_char *bp, register u_int length,
    register const u_char *bp2)
{
      register const struct ospfhdr *op;
      register const struct ip *ip;
      register const u_char *dataend;
      register const char *cp;

      op = (struct ospfhdr *)bp;
      ip = (struct ip *)bp2;

        /* XXX Before we do anything else, strip off the MD5 trailer */
        TCHECK(op->ospf_authtype);
        if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
                length -= OSPF_AUTH_MD5_LEN;
                snapend -= OSPF_AUTH_MD5_LEN;
        }

      /* If the type is valid translate it, or just print the type */
      /* value.  If it's not valid, say so and return */
      TCHECK(op->ospf_type);
      cp = tok2str(type2str, "unknown LS-type", op->ospf_type);
      printf("OSPFv%u, %s (%u), length: %u",
             op->ospf_version,
             cp,
             op->ospf_type,
             length);
      if (*cp == 'u')
            return;

        if(!vflag) /* non verbose - so lets bail out here */
                return;

      TCHECK(op->ospf_len);
      if (length != EXTRACT_16BITS(&op->ospf_len)) {
            printf(" [len %d]", EXTRACT_16BITS(&op->ospf_len));
            return;
      }
      dataend = bp + length;

      TCHECK(op->ospf_routerid);
        printf("\n\tRouter-ID: %s", ipaddr_string(&op->ospf_routerid));

      TCHECK(op->ospf_areaid);
      if (op->ospf_areaid.s_addr != 0)
            printf(", Area %s", ipaddr_string(&op->ospf_areaid));
      else
            printf(", Backbone Area");

      if (vflag) {
            /* Print authentication data (should we really do this?) */
            TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));

                printf(", Authentication Type: %s (%u)",
                       tok2str(ospf_authtype_values,"unknown",EXTRACT_16BITS(&op->ospf_authtype)),
                       EXTRACT_16BITS(&op->ospf_authtype));

            switch (EXTRACT_16BITS(&op->ospf_authtype)) {

            case OSPF_AUTH_NONE:
                  break;

            case OSPF_AUTH_SIMPLE:
                  (void)fn_printn(op->ospf_authdata,
                      sizeof(op->ospf_authdata), NULL);
                  printf("\"");
                  break;

            case OSPF_AUTH_MD5:
                        printf("\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
                               *((op->ospf_authdata)+2),
                               *((op->ospf_authdata)+3),
                               EXTRACT_32BITS((op->ospf_authdata)+4));
                  break;

            default:
                  return;
            }
      }
      /* Do rest according to version.     */
      switch (op->ospf_version) {

      case 2:
            /* ospf version 2 */
            if (ospf_decode_v2(op, dataend))
                  goto trunc;
            break;

      default:
            printf(" ospf [version %d]", op->ospf_version);
            break;
      }                 /* end switch on version */

      return;
trunc:
      fputs(tstr, stdout);
}

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